<template>
    <div class='home-category' @mouseleave="categoryId=null">
        <ul class="menu">
            <li v-for="item in menuList" :key="item.id" :class="{active:categoryId===item.id}" @mouseenter="categoryId=item.id">
                <RouterLink to="`/category/${item.id}`">{{item.name}}</RouterLink>
                <template v-if="item.children">
                    <RouterLink v-for="sub in item.children" 
                    :key="sub.id" :to="`/category/sub/${sub.id}`">
                      {{sub.name}}
                    </RouterLink>
                </template>
                  <template v-else>
                    <CsSkeleton width="60px" height="18px" style="margin-right:5px" bg="rgba(255,255,255,0.2)" />
                    <CsSkeleton width="50px" height="18px" bg="rgba(255,255,255,0.2)" />
                  </template>
            </li>
        </ul>
        <!-- 弹层 -->
        <div class="layer">
            <h4 v-if="currCategory">{{currCategory&&currCategory.id === 'brand'?'品牌':'分类'}}推荐 <small>根据您的购买或浏览记录推荐</small></h4>
            <!-- 商品 -->
            <ul v-if="currCategory && currCategory.goods && currCategory.goods.length">
                <li v-for="item in currCategory.goods" :key="item.id">
                <RouterLink to="/">
                    <img :src="item.picture" alt="">
                    <div class="info">
                        <p class="name ellipsis-2">{{item.name}}</p>
                        <p class="desc ellipsis">{{item.desc}}</p>
                        <p class="price"><i>¥</i>{{item.price}}</p>
                    </div>
                </RouterLink>
                </li>
            </ul>
            <!-- 品牌 -->
            <ul v-if="currCategory && currCategory.brands">
                <li class="brand" v-for="brand in currCategory.brands" :key="brand.id">
                    <RouterLink to="/">
                    <img :src="brand.picture" alt="">
                    <div class="info">
                        <p class="place"><i class="iconfont icon-dingwei"></i>{{brand.place}}</p>
                        <p class="name ellipsis">{{brand.name}}</p>
                        <p class="desc ellipsis-2">{{brand.desc}}</p>
                    </div>
                    </RouterLink>
                </li>
            </ul>
        </div>
    </div>
</template>

<script>
import { reactive,computed,ref } from 'vue'
import { useStore } from 'vuex'
import { findBrand } from '@/api/home'
export default {
    name: 'HomeCategory',
    // 1.获取vuex的一级分类，并且只需要两个二级分类
    // 2.需要在组件内部，定义一个品牌数据
    // 3.根据vuex的分类数据和组件中定义品牌数据，得到左侧分类完整数据（9分类+1品牌）数组
    // 4.进行渲染即可
    setup() {
        const brand = reactive({
            id: 'brand',
            name: '品牌',
            children: [{id:'brand-children',name:'品牌推荐'}],
            //品牌列表
            brands: []
        })

        const store = useStore()
        const menuList = computed(() => {
            const list = store.state.category.list.map((item) =>{
                return{
                    id:item.id,
                    name:item.name,
                    // 防止初始化没有children的时候调用slice函数报错
                    children: item.children && item.children.slice(0,2),
                    goods: item.goods
                }
            })
            list.push(brand)
            return list
        })
        // 得到弹出层的推荐商品数据
        const categoryId = ref(null)
        const currCategory = computed(() => {
        return menuList.value.find(item => item.id === categoryId.value)
        })

        // 获取品牌数据，尽量不用使用async再setup上
        findBrand().then(data => {
            brand.brands = data.result
        })

        return { menuList,categoryId,currCategory }
    }
}
</script>

<style scoped lang='less'>
.home-category {
  width: 250px;
  height: 500px;
  background: rgba(0, 0, 0, 0.8);
  position: relative;
  z-index: 99;
  .menu {
    li {
      padding-left: 40px;
      height: 50px;
      line-height: 50px;
      &:hover,&.active {
        background: @xtxColor;
      }
      a {
        margin-right: 4px;
        color: #fff;
        &:first-child {
          font-size: 16px;
        }
      }
    }
  }
  // 弹出层样式
    .layer {
    width: 990px;
    height: 500px;
    background: rgba(255,255,255,0.8);
    position: absolute;
    left: 250px;
    top: 0;
    display: none;
    padding: 0 15px;
    h4 {
      font-size: 20px;
      font-weight: normal;
      line-height: 80px;
      small {
        font-size: 16px;
        color: #666;
      }
    }
    ul {
      display: flex;
      flex-wrap: wrap;
      li {
        width: 310px;
        height: 120px;
        margin-right: 15px;
        margin-bottom: 15px;
        border: 1px solid #eee;
        border-radius: 4px;
        background: #fff;
        &:nth-child(3n) {
          margin-right: 0;
        }
        a {
          display: flex;
          width: 100%;
          height: 100%;
          align-items: center;
          padding: 10px;
          &:hover {
            background: #e3f9f4;
          }
          img {
              width: 95px;
              height: 95px;
          }
          .info {
            padding-left: 10px;
            line-height: 24px;
            width: 190px;
            .name {
              font-size: 16px;
              color: #666;
            }
            .desc {
              color: #999;
            }
            .price {
              font-size: 22px;
              color: @priceColor;
              i {
                font-size: 16px;
              }
            }
          }
        }
      }
      // 品牌的样式
      li.brand {
        height: 180px;
        a {
          align-items: flex-start;
          img {
            width: 120px;
            height: 160px;
          }
          .info {
            p {
              margin-top: 8px;
            }
            .place {
              color: #999;
            }
          }
        }
      }
    }
  }
  &:hover {
    .layer {
      display: block;
    }
  }
}

//骨架动画
.cs-skeleton {
  animation: fade 1s linear infinite alternate;
}
@keyframes fade {
  from {
    opacity: 0.2;
  }
  to {
    opacity: 1;
  }
}

</style>